Peter said me that previous results http://www.mysqlperformanceblog.com/2008/12/18/xtradb-benchmarks-15x-gain/ are too marketing, and we should show other results also.
That’s right, as I said - do not expect performance gain in CPU bound benchmarks (at least on 8 and less CPU cores boxes). There are results for the same workload but with innodb_buffer_pool_size=8G, that is all data fits into memory.
As you see difference is just nothing, about 2.5%, which can be an error in measurement. It actually would be interesting to test on 16 cores servers - let me know if you have free one 
Entry posted by Vadim | No comment
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